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class="sidebar-link">位图管理</a></li><li><a href="/blog/09.html" class="sidebar-link">POSIX</a></li><li><a href="/blog/10.html" class="sidebar-link">main函数</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading clickable"><!----> <span class="title">进程管理 | 10</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading clickable"><!----> <span class="title">任务管理 | 10</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading clickable"><!----> <span class="title">内存管理 | 10</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading clickable"><!----> <span class="title">通讯机制 | 14</span> <span class="arrow right"></span></p> <!----></section></li><li><section 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class="sidebar-group collapsable depth-0"><p class="sidebar-heading clickable"><!----> <span class="title">前因后果 | 4</span> <span class="arrow right"></span></p> <!----></section></li></ul> <!----> <div class="content__sidebar-bottom"></div> <!----></aside> <main class="page"><nav class="breadcrumb disable"><!----></nav> <!----> <div class="content__page-top"></div> <div vocab="https://schema.org/" typeof="Article" class="page-title"><h1><!----> <span property="headline"></span></h1> <div class="page-info"><!----> </div> <!----> <hr></div> <div class="anchor-place-holder"><aside id="anchor"><div class="anchor-wrapper"><ul class="anchor-list"><li class="anchor"><a href="/blog/01.html#双向链表是什么" class="anchor-link heading3"><div>双向链表是什么？</div></a></li><li class="anchor"><a href="/blog/01.html#怎么实现" class="anchor-link heading3"><div>怎么实现 ？</div></a></li><li class="anchor"><a href="/blog/01.html#数据在哪" class="anchor-link heading3"><div>数据在哪 ？</div></a></li><li class="anchor"><a href="/blog/01.html#强大的宏" class="anchor-link heading3"><div>强大的宏</div></a></li><li class="anchor"><a href="/blog/01.html#los-off-set-of-和-los-dl-list-entry" class="anchor-link heading3"><div>LOSOFFSETOF 和 LOSDLLISTENTRY</div></a></li><li class="anchor"><a href="/blog/01.html#osgettoptask" class="anchor-link heading3"><div>OsGetTopTask</div></a></li><li class="anchor"><a href="/blog/01.html#结构体的最爱" class="anchor-link heading3"><div>结构体的最爱</div></a></li><li class="anchor"><a href="/blog/01.html#百文说内核-抓住主脉络" class="anchor-link heading3"><div>百文说内核 | 抓住主脉络</div></a></li><li class="anchor"><a href="/blog/01.html#百万注源码-处处扣细节" class="anchor-link heading3"><div>百万注源码 | 处处扣细节</div></a></li><li class="anchor"><a href="/blog/01.html#关注不迷路-代码即人生" class="anchor-link heading3"><div>关注不迷路 | 代码即人生</div></a></li></ul></div></aside></div> <!----> <div class="content__content-top"></div> <div class="theme-default-content content__default"><p>本篇关键词：双向链表 、递减满栈、增删改查、</p> <p><a href="https://weharmony.gitee.io/blog/01.html" target="_blank" rel="noopener noreferrer"><img src="https://weharmonyos.oss-cn-hangzhou.aliyuncs.com/resources/index/01.png" alt=""></a></p> <p><a href="https://weharmonyos.oss-cn-hangzhou.aliyuncs.com/resources/pdf/%E9%B8%BF%E8%92%99%E5%86%85%E6%A0%B8%E6%BA%90%E7%A0%81%E5%88%86%E6%9E%90(%E7%99%BE%E7%AF%87%E5%8D%9A%E5%AE%A2%E5%88%86%E6%9E%90.%E6%8C%96%E9%80%8F%E9%B8%BF%E8%92%99%E5%86%85%E6%A0%B8).zip" target="_blank" rel="noopener noreferrer">下载 &gt;&gt; 离线文档.鸿蒙内核源码分析(百篇博客分析.挖透鸿蒙内核).pdf</a></p> <p>基础知识相关篇为:</p> <ul><li><a href="http://weharmonyos.com/blog/01.html" target="_blank" rel="noopener noreferrer">v01.12 鸿蒙内核源码分析(双向链表) | 谁是内核最重要结构体</a></li> <li><a href="http://weharmonyos.com/blog/02.html" target="_blank" rel="noopener noreferrer">v02.01 鸿蒙内核源码分析(内核概念) | 名不正则言不顺</a></li> <li><a href="http://weharmonyos.com/blog/03.html" target="_blank" rel="noopener noreferrer">v03.02 鸿蒙内核源码分析(源码结构) | 宏观尺度看内核结构</a></li> <li><a href="http://weharmonyos.com/blog/04.html" target="_blank" rel="noopener noreferrer">v04.01 鸿蒙内核源码分析(地址空间) | 内核如何看待空间</a></li> <li><a href="http://weharmonyos.com/blog/05.html" target="_blank" rel="noopener noreferrer">v05.03 鸿蒙内核源码分析(计时单位) | 内核如何看待时间</a></li> <li><a href="http://weharmonyos.com/blog/06.html" target="_blank" rel="noopener noreferrer">v06.01 鸿蒙内核源码分析(优雅的宏) | 编译器也喜欢复制粘贴 </a></li> <li><a href="http://weharmonyos.com/blog/07.html" target="_blank" rel="noopener noreferrer">v07.01 鸿蒙内核源码分析(钩子框架) | 万物皆可HOOK </a></li> <li><a href="http://weharmonyos.com/blog/08.html" target="_blank" rel="noopener noreferrer">v08.04 鸿蒙内核源码分析(位图管理) | 一分钱被掰成八半使用</a></li> <li><a href="http://weharmonyos.com/blog/09.html" target="_blank" rel="noopener noreferrer">v09.01 鸿蒙内核源码分析(POSIX) | 操作系统界的话事人 </a></li> <li><a href="http://weharmonyos.com/blog/10.html" target="_blank" rel="noopener noreferrer">v10.01 鸿蒙内核源码分析(main函数) | 要走了无数码农的第一次 </a></li></ul> <h3 id="双向链表是什么">双向链表是什么？</h3> <p>谁是鸿蒙内核最重要的结构体 ？ 一定是: <code>LOS_DL_LIST</code>(双向链表)， 它长这样。</p> <div class="language-c line-numbers-mode"><pre class="language-c"><code><span class="token keyword">typedef</span> <span class="token keyword">struct</span> <span class="token class-name">LOS_DL_LIST</span> <span class="token punctuation">{</span>
    <span class="token keyword">struct</span> <span class="token class-name">LOS_DL_LIST</span> <span class="token operator">*</span>pstPrev<span class="token punctuation">;</span> <span class="token comment">/**&lt; Current node's pointer to the previous node | 前驱节点(左手)*/</span>
    <span class="token keyword">struct</span> <span class="token class-name">LOS_DL_LIST</span> <span class="token operator">*</span>pstNext<span class="token punctuation">;</span> <span class="token comment">/**&lt; Current node's pointer to the next node | 后继节点(右手)*/</span>
<span class="token punctuation">}</span> LOS_DL_LIST<span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>在<code>linux</code> 中是 <code>list_head</code>， 很简单，只有两个指向自己的指针，但因为太简单，所以不简单。站长更愿意将它比喻成人的左右手，其意义是通过寄生在宿主结构体上来体现，可想象成在宿主结构体装上一对对勤劳的双手，它真的很会来事，超级活跃分子，为宿主到处拉朋友，建圈子。</p> <ul><li><p>基本概念：双向链表是指含有往前和往后两个方向的链表，即每个结点中除存放下一个节点指针外，还增加一个指向前一个节点的指针， 从双向链表中的任意一个结点开始，都可以很方便地访问它的前驱结点和后继结点，这种数据结构形式使得双向链表在查找时更加方便，特别是大量数据的遍历。由于双向链表具有对称性，能方便地完成各种插入、删除等操作。</p></li> <li><p>使用场景：在内核的各个模块都能看到双向链表的身影，下图是初始化双向链表的操作，因为太多了，只截取了部分:</p> <p><img src="https://weharmonyos.oss-cn-hangzhou.aliyuncs.com/resources/1/ListInit.png" alt=""></p></li> <li><p>可以豪不夸张的说理解<code>LOS_DL_LIST</code>及相关函数是读懂鸿蒙内核的关键。前后指针(左右触手)灵活的指挥着系统精准的运行，越是深挖内核代码越是能体会到它在内核举足轻重的地位， 笔者仿佛看到了无数双手前后相连，拉起了一个个双向循环链表，把指针的高效能运用到了极致，这也许就是编程的艺术吧！</p></li></ul> <h3 id="怎么实现">怎么实现 ？</h3> <p>鸿蒙系统中的双向链表模块为用户提供下面几个接口。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>功能分类            接口名	                    描述
初始化链表          LOS_ListInit                对链表进行初始化
增加节点            LOS_ListAdd                 将新节点添加到链表中
在链表尾部插入节点   LOS_ListTailInsert          将节点插入到双向链表尾部
在链表头部插入节点   LOS_ListHeadInsert          将节点插入到双向链表头部
删除节点            LOS_ListDelete              将指定的节点从链表中删除
判断双向链表是否为空 LOS_ListEmpty               判断链表是否为空
删除节点并初始化链表 LOS_ListDelInit             将指定的节点从链表中删除使用该节点初始化链表
在链表尾部插入链表   LOS_ListTailInsertList	将链表插入到双向链表尾部
在链表头部插入链表   LOS_ListHeadInsertList	将链表插入到双向链表头部

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><p>其插入 | 删除 | 遍历操作是它最常用的社交三大件，若不理解透彻在分析源码过程中很容易卡壳。虽在网上能找到很多它的图,但怎么看都不是自己想要的，干脆重画了它的主要操作。</p> <p><img src="https://weharmonyos.oss-cn-hangzhou.aliyuncs.com/resources/100pic/1_list_100.png" alt=""></p> <div class="language-c line-numbers-mode"><pre class="language-c"><code><span class="token comment">//将指定节点初始化为双向链表节点</span>
LITE_OS_SEC_ALW_INLINE STATIC INLINE VOID <span class="token function">LOS_ListInit</span><span class="token punctuation">(</span>LOS_DL_LIST <span class="token operator">*</span>list<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
    list<span class="token operator">-&gt;</span>pstNext <span class="token operator">=</span> list<span class="token punctuation">;</span>
    list<span class="token operator">-&gt;</span>pstPrev <span class="token operator">=</span> list<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token comment">//将指定节点挂到双向链表头部</span>
LITE_OS_SEC_ALW_INLINE STATIC INLINE VOID <span class="token function">LOS_ListAdd</span><span class="token punctuation">(</span>LOS_DL_LIST <span class="token operator">*</span>list<span class="token punctuation">,</span> LOS_DL_LIST <span class="token operator">*</span>node<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
    node<span class="token operator">-&gt;</span>pstNext <span class="token operator">=</span> list<span class="token operator">-&gt;</span>pstNext<span class="token punctuation">;</span>
    node<span class="token operator">-&gt;</span>pstPrev <span class="token operator">=</span> list<span class="token punctuation">;</span>
    list<span class="token operator">-&gt;</span>pstNext<span class="token operator">-&gt;</span>pstPrev <span class="token operator">=</span> node<span class="token punctuation">;</span>
    list<span class="token operator">-&gt;</span>pstNext <span class="token operator">=</span> node<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">//将指定节点从链表中删除，自己把自己摘掉</span>
LITE_OS_SEC_ALW_INLINE STATIC INLINE VOID <span class="token function">LOS_ListDelete</span><span class="token punctuation">(</span>LOS_DL_LIST <span class="token operator">*</span>node<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
    node<span class="token operator">-&gt;</span>pstNext<span class="token operator">-&gt;</span>pstPrev <span class="token operator">=</span> node<span class="token operator">-&gt;</span>pstPrev<span class="token punctuation">;</span>
    node<span class="token operator">-&gt;</span>pstPrev<span class="token operator">-&gt;</span>pstNext <span class="token operator">=</span> node<span class="token operator">-&gt;</span>pstNext<span class="token punctuation">;</span>
    node<span class="token operator">-&gt;</span>pstNext <span class="token operator">=</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
    node<span class="token operator">-&gt;</span>pstPrev <span class="token operator">=</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">//将指定节点从链表中删除，并使用该节点初始化链表</span>
LITE_OS_SEC_ALW_INLINE STATIC INLINE VOID <span class="token function">LOS_ListDelInit</span><span class="token punctuation">(</span>LOS_DL_LIST <span class="token operator">*</span>list<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
    list<span class="token operator">-&gt;</span>pstNext<span class="token operator">-&gt;</span>pstPrev <span class="token operator">=</span> list<span class="token operator">-&gt;</span>pstPrev<span class="token punctuation">;</span>
    list<span class="token operator">-&gt;</span>pstPrev<span class="token operator">-&gt;</span>pstNext <span class="token operator">=</span> list<span class="token operator">-&gt;</span>pstNext<span class="token punctuation">;</span>
    <span class="token function">LOS_ListInit</span><span class="token punctuation">(</span>list<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br></div></div><h3 id="数据在哪">数据在哪 ？</h3> <p>有好几个同学问数据在哪？ 确实<code>LOS_DL_LIST</code>这个结构看起来怪怪的，它竟没有数据域！所以看到这个结构的人第一反应就是我们怎么访问数据？其实<code>LOS_DL_LIST</code>不是拿来单独用的，它是寄生在内容结构体上的，谁用它谁就是它的数据。看图就明白了。</p> <p><img src="https://weharmonyos.oss-cn-hangzhou.aliyuncs.com/resources/1/list_head.jpg" alt=""></p> <h3 id="强大的宏">强大的宏</h3> <p>除了内联函数，对双向链表的初始化，偏移定位，遍历 等等操作提供了更强大的宏支持。使内核以极其简洁高效的代码实现复杂逻辑的处理。</p> <div class="language-c line-numbers-mode"><pre class="language-c"><code><span class="token comment">//定义一个节点并初始化为双向链表节点</span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">define</span> <span class="token macro-name function">LOS_DL_LIST_HEAD</span><span class="token expression"><span class="token punctuation">(</span>list<span class="token punctuation">)</span> LOS_DL_LIST list <span class="token operator">=</span> <span class="token punctuation">{</span> <span class="token operator">&amp;</span><span class="token punctuation">(</span>list<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token operator">&amp;</span><span class="token punctuation">(</span>list<span class="token punctuation">)</span> <span class="token punctuation">}</span></span></span>

<span class="token comment">//获取指定结构体内的成员相对于结构体起始地址的偏移量</span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">define</span> <span class="token macro-name function">LOS_OFF_SET_OF</span><span class="token expression"><span class="token punctuation">(</span>type<span class="token punctuation">,</span> member<span class="token punctuation">)</span> <span class="token punctuation">(</span><span class="token punctuation">(</span>UINTPTR<span class="token punctuation">)</span><span class="token operator">&amp;</span><span class="token punctuation">(</span><span class="token punctuation">(</span>type <span class="token operator">*</span><span class="token punctuation">)</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token operator">-&gt;</span>member<span class="token punctuation">)</span></span></span>

<span class="token comment">//获取包含链表的结构体地址，接口的第一个入参表示的是链表中的某个节点，第二个入参是要获取的结构体名称，第三个入参是链表在该结构体中的名称</span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">define</span> <span class="token macro-name function">LOS_DL_LIST_ENTRY</span><span class="token expression"><span class="token punctuation">(</span>item<span class="token punctuation">,</span> type<span class="token punctuation">,</span> member<span class="token punctuation">)</span> </span><span class="token punctuation">\</span>
    <span class="token expression"><span class="token punctuation">(</span><span class="token punctuation">(</span>type <span class="token operator">*</span><span class="token punctuation">)</span><span class="token punctuation">(</span>VOID <span class="token operator">*</span><span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token punctuation">(</span>CHAR <span class="token operator">*</span><span class="token punctuation">)</span><span class="token punctuation">(</span>item<span class="token punctuation">)</span> <span class="token operator">-</span> <span class="token function">LOS_OFF_SET_OF</span><span class="token punctuation">(</span>type<span class="token punctuation">,</span> member<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span></span></span>

<span class="token comment">//遍历双向链表</span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">define</span> <span class="token macro-name function">LOS_DL_LIST_FOR_EACH</span><span class="token expression"><span class="token punctuation">(</span>item<span class="token punctuation">,</span> list<span class="token punctuation">)</span> </span><span class="token punctuation">\</span>
    <span class="token expression"><span class="token keyword">for</span> <span class="token punctuation">(</span>item <span class="token operator">=</span> <span class="token punctuation">(</span>list<span class="token punctuation">)</span><span class="token operator">-&gt;</span>pstNext<span class="token punctuation">;</span>         </span><span class="token punctuation">\</span>
         <span class="token expression"><span class="token punctuation">(</span>item<span class="token punctuation">)</span> <span class="token operator">!=</span> <span class="token punctuation">(</span>list<span class="token punctuation">)</span><span class="token punctuation">;</span>               </span><span class="token punctuation">\</span>
         <span class="token expression">item <span class="token operator">=</span> <span class="token punctuation">(</span>item<span class="token punctuation">)</span><span class="token operator">-&gt;</span>pstNext<span class="token punctuation">)</span></span></span>

<span class="token comment">//遍历指定双向链表，获取包含该链表节点的结构体地址，并存储包含当前节点的后继节点的结构体地址</span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">define</span> <span class="token macro-name function">LOS_DL_LIST_FOR_EACH_ENTRY_SAFE</span><span class="token expression"><span class="token punctuation">(</span>item<span class="token punctuation">,</span> next<span class="token punctuation">,</span> list<span class="token punctuation">,</span> type<span class="token punctuation">,</span> member<span class="token punctuation">)</span>               </span><span class="token punctuation">\</span>
    <span class="token expression"><span class="token keyword">for</span> <span class="token punctuation">(</span>item <span class="token operator">=</span> <span class="token function">LOS_DL_LIST_ENTRY</span><span class="token punctuation">(</span><span class="token punctuation">(</span>list<span class="token punctuation">)</span><span class="token operator">-&gt;</span>pstNext<span class="token punctuation">,</span> type<span class="token punctuation">,</span> member<span class="token punctuation">)</span>，                     </span><span class="token punctuation">\</span>
         <span class="token expression">next <span class="token operator">=</span> <span class="token function">LOS_DL_LIST_ENTRY</span><span class="token punctuation">(</span><span class="token punctuation">(</span>item<span class="token punctuation">)</span><span class="token operator">-&gt;</span>member<span class="token punctuation">.</span>pstNext<span class="token punctuation">,</span> type<span class="token punctuation">,</span> member<span class="token punctuation">)</span><span class="token punctuation">;</span>              </span><span class="token punctuation">\</span>
         <span class="token expression"><span class="token operator">&amp;</span><span class="token punctuation">(</span>item<span class="token punctuation">)</span><span class="token operator">-&gt;</span>member <span class="token operator">!=</span> <span class="token punctuation">(</span>list<span class="token punctuation">)</span><span class="token punctuation">;</span>                                                   </span><span class="token punctuation">\</span>
         <span class="token expression">item <span class="token operator">=</span> next<span class="token punctuation">,</span> next <span class="token operator">=</span> <span class="token function">LOS_DL_LIST_ENTRY</span><span class="token punctuation">(</span><span class="token punctuation">(</span>item<span class="token punctuation">)</span><span class="token operator">-&gt;</span>member<span class="token punctuation">.</span>pstNext<span class="token punctuation">,</span> type<span class="token punctuation">,</span> member<span class="token punctuation">)</span><span class="token punctuation">)</span></span></span>

<span class="token comment">//遍历指定双向链表，获取包含该链表节点的结构体地址</span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">define</span> <span class="token macro-name function">LOS_DL_LIST_FOR_EACH_ENTRY</span><span class="token expression"><span class="token punctuation">(</span>item<span class="token punctuation">,</span> list<span class="token punctuation">,</span> type<span class="token punctuation">,</span> member<span class="token punctuation">)</span>             </span><span class="token punctuation">\</span>
    <span class="token expression"><span class="token keyword">for</span> <span class="token punctuation">(</span>item <span class="token operator">=</span> <span class="token function">LOS_DL_LIST_ENTRY</span><span class="token punctuation">(</span><span class="token punctuation">(</span>list<span class="token punctuation">)</span><span class="token operator">-&gt;</span>pstNext<span class="token punctuation">,</span> type<span class="token punctuation">,</span> member<span class="token punctuation">)</span><span class="token punctuation">;</span>        </span><span class="token punctuation">\</span>
         <span class="token expression"><span class="token operator">&amp;</span><span class="token punctuation">(</span>item<span class="token punctuation">)</span><span class="token operator">-&gt;</span>member <span class="token operator">!=</span> <span class="token punctuation">(</span>list<span class="token punctuation">)</span><span class="token punctuation">;</span>                                      </span><span class="token punctuation">\</span>
         <span class="token expression">item <span class="token operator">=</span> <span class="token function">LOS_DL_LIST_ENTRY</span><span class="token punctuation">(</span><span class="token punctuation">(</span>item<span class="token punctuation">)</span><span class="token operator">-&gt;</span>member<span class="token punctuation">.</span>pstNext<span class="token punctuation">,</span> type<span class="token punctuation">,</span> member<span class="token punctuation">)</span><span class="token punctuation">)</span></span></span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br></div></div><h3 id="los-off-set-of-和-los-dl-list-entry">LOS_OFF_SET_OF 和 LOS_DL_LIST_ENTRY</h3> <p>这里要重点说下 <code>LOS_OFF_SET_OF</code>和<code>LOS_DL_LIST_ENTRY</code>两个宏，个人认为它们是链表操作中最关键，最重要的宏。在读内核源码的过程会发现<code>LOS_DL_LIST_ENTRY</code>高频的出现，它们解决了通过结构体的任意一个成员变量来找到结构体的入口地址。
这个意义重大，因为在运行过程中，往往只能提供成员变量的地址，那它是如何做到通过个人找到组织的呢？</p> <ul><li><code>LOS_OFF_SET_OF</code> 用于找到成员变量在结构体中的相对偏移位置， 在系列篇 <strong>(用栈方式篇)</strong> 中 已说过 鸿蒙采用的是递减满栈的方式。而使用 <strong>((type *)0)-&gt;member</strong> 是获取 <code>struct</code> 成员偏移量的技巧，需要编译器的支持，这种方法背后的想法是让编译器假设结构起始地址位于零并计算成员的地址。 以<code>ProcessCB</code> 结构体举例</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>typedef struct ProcessCB {
    // ... 
    LOS_DL_LIST          pendList;                     /**&lt; Block list to which the process belongs | 进程所在的阻塞列表,进程因阻塞挂入相应的链表.*/
    LOS_DL_LIST          childrenList;                 /**&lt; Children process list | 孩子进程都挂到这里,形成双循环链表*/
    LOS_DL_LIST          exitChildList;                /**&lt; Exit children process list | 要退出的孩子进程链表，白发人要送黑发人.*/
    LOS_DL_LIST          siblingList;                  /**&lt; Linkage in parent's children list | 兄弟进程链表, 56个民族是一家,来自同一个父进程.*/
    LOS_DL_LIST          subordinateGroupList;         /**&lt; Linkage in group list | 进程组员链表*/
    LOS_DL_LIST          threadSiblingList;            /**&lt; List of threads under this process | 进程的线程(任务)列表 */
    LOS_DL_LIST          waitList;     /**&lt; The process holds the waitLits to support wait/waitpid | 父进程通过进程等待的方式，回收子进程资源，获取子进程退出信息*/
} LosProcessCB;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><p><code>waitList</code>因为在结构体的后面，所以它内存地址会比在前面的<code>pendList</code>高，有了顺序方向就很容易得到<code>ProcessCB</code>的第一个变量的地址。<code>LOS_OFF_SET_OF</code>就是干这个的，含义就是相对第一个变量地址，你<code>waitList</code>偏移了多少。</p> <ul><li>如此，当外面只提供<code>waitList</code>的地址再减去偏移地址 就可以得到<code>ProcessCB</code>的起始地址。</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>#define LOS_DL_LIST_ENTRY(item， type， member) \
    ((type *)(VOID *)((CHAR *)(item) - LOS_OFF_SET_OF(type， member)))
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>当然如果提供<code>pendList</code>或<code>exitChildList</code>的地址道理一样。<code>LOS_DL_LIST_ENTRY</code>实现了通过任意成员变量来获取<code>ProcessCB</code>的起始地址。</p> <h3 id="osgettoptask">OsGetTopTask</h3> <p>有了以上对链表操作的宏，可以使得代码变得简洁易懂，例如在调度算法中获取当前最高优先级的任务时，就需要遍历整个进程和其任务的就绪列表。<code>LOS_DL_LIST_FOR_EACH_ENTRY</code>高效的解决了层层循环的问题。</p> <div class="language-c line-numbers-mode"><pre class="language-c"><code>LITE_OS_SEC_TEXT_MINOR LosTaskCB <span class="token operator">*</span><span class="token function">OsGetTopTask</span><span class="token punctuation">(</span>VOID<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
    UINT32 priority， processPriority<span class="token punctuation">;</span>
    UINT32 bitmap<span class="token punctuation">;</span>
    UINT32 processBitmap<span class="token punctuation">;</span>
    LosTaskCB <span class="token operator">*</span>newTask <span class="token operator">=</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">if</span> <span class="token expression"><span class="token punctuation">(</span>LOSCFG_KERNEL_SMP <span class="token operator">==</span> YES<span class="token punctuation">)</span></span></span>
    UINT32 cpuid <span class="token operator">=</span> <span class="token function">ArchCurrCpuid</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">endif</span></span>
    LosProcessCB <span class="token operator">*</span>processCB <span class="token operator">=</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
    processBitmap <span class="token operator">=</span> g_priQueueBitmap<span class="token punctuation">;</span>
    <span class="token keyword">while</span> <span class="token punctuation">(</span>processBitmap<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        processPriority <span class="token operator">=</span> <span class="token function">CLZ</span><span class="token punctuation">(</span>processBitmap<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token function">LOS_DL_LIST_FOR_EACH_ENTRY</span><span class="token punctuation">(</span>processCB， <span class="token operator">&amp;</span>g_priQueueList<span class="token punctuation">[</span>processPriority<span class="token punctuation">]</span>， LosProcessCB， pendList<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            bitmap <span class="token operator">=</span> processCB<span class="token operator">-&gt;</span>threadScheduleMap<span class="token punctuation">;</span>
            <span class="token keyword">while</span> <span class="token punctuation">(</span>bitmap<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                priority <span class="token operator">=</span> <span class="token function">CLZ</span><span class="token punctuation">(</span>bitmap<span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token function">LOS_DL_LIST_FOR_EACH_ENTRY</span><span class="token punctuation">(</span>newTask， <span class="token operator">&amp;</span>processCB<span class="token operator">-&gt;</span>threadPriQueueList<span class="token punctuation">[</span>priority<span class="token punctuation">]</span>， LosTaskCB， pendList<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">if</span> <span class="token expression"><span class="token punctuation">(</span>LOSCFG_KERNEL_SMP <span class="token operator">==</span> YES<span class="token punctuation">)</span></span></span>
                    <span class="token keyword">if</span> <span class="token punctuation">(</span>newTask<span class="token operator">-&gt;</span>cpuAffiMask <span class="token operator">&amp;</span> <span class="token punctuation">(</span><span class="token number">1U</span> <span class="token operator">&lt;&lt;</span> cpuid<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">endif</span></span>
                        newTask<span class="token operator">-&gt;</span>taskStatus <span class="token operator">&amp;=</span> <span class="token operator">~</span>OS_TASK_STATUS_READY<span class="token punctuation">;</span>
                        <span class="token function">OsPriQueueDequeue</span><span class="token punctuation">(</span>processCB<span class="token operator">-&gt;</span>threadPriQueueList，
                                          <span class="token operator">&amp;</span>processCB<span class="token operator">-&gt;</span>threadScheduleMap，
                                          <span class="token operator">&amp;</span>newTask<span class="token operator">-&gt;</span>pendList<span class="token punctuation">)</span><span class="token punctuation">;</span>
                        <span class="token function">OsDequeEmptySchedMap</span><span class="token punctuation">(</span>processCB<span class="token punctuation">)</span><span class="token punctuation">;</span>
                        <span class="token keyword">goto</span> OUT<span class="token punctuation">;</span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">if</span> <span class="token expression"><span class="token punctuation">(</span>LOSCFG_KERNEL_SMP <span class="token operator">==</span> YES<span class="token punctuation">)</span></span></span>
                    <span class="token punctuation">}</span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">endif</span></span>
                <span class="token punctuation">}</span>
                bitmap <span class="token operator">&amp;=</span> <span class="token operator">~</span><span class="token punctuation">(</span><span class="token number">1U</span> <span class="token operator">&lt;&lt;</span> <span class="token punctuation">(</span>OS_PRIORITY_QUEUE_NUM <span class="token operator">-</span> priority <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span>
        processBitmap <span class="token operator">&amp;=</span> <span class="token operator">~</span><span class="token punctuation">(</span><span class="token number">1U</span> <span class="token operator">&lt;&lt;</span> <span class="token punctuation">(</span>OS_PRIORITY_QUEUE_NUM <span class="token operator">-</span> processPriority <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

OUT<span class="token operator">:</span>
    <span class="token keyword">return</span> newTask<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br></div></div><h3 id="结构体的最爱">结构体的最爱</h3> <p><code>LOS_DL_LIST</code>是复杂结构体的最爱，再以 <code>ProcessCB</code>(进程控制块)举例，它是描述一个进程的所有信息，其中用到了 <code>7</code>个双向链表，这简直比章鱼还牛逼，章鱼也才四双触手，但进程有<code>7</code>双(<code>14</code>只)触手。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>typedef struct ProcessCB {
    LOS_DL_LIST          pendList;                     /**&lt; Block list to which the process belongs | 进程所在的阻塞列表,进程因阻塞挂入相应的链表.*/
    LOS_DL_LIST          childrenList;                 /**&lt; Children process list | 孩子进程都挂到这里,形成双循环链表*/
    LOS_DL_LIST          exitChildList;                /**&lt; Exit children process list | 要退出的孩子进程链表，白发人要送黑发人.*/
    LOS_DL_LIST          siblingList;                  /**&lt; Linkage in parent's children list | 兄弟进程链表, 56个民族是一家,来自同一个父进程.*/
    LOS_DL_LIST          subordinateGroupList;         /**&lt; Linkage in group list | 进程组员链表*/
    LOS_DL_LIST          threadSiblingList;            /**&lt; List of threads under this process | 进程的线程(任务)列表 */
    LOS_DL_LIST          waitList;     /**&lt; The process holds the waitLits to support wait/waitpid | 父进程通过进程等待的方式，回收子进程资源，获取子进程退出信息*/
} LosProcessCB;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p><strong>解读</strong></p> <ul><li><code>pendList</code> 个人认为它是鸿蒙内核功能最多的一个链表，它远不止字面意思阻塞链表这么简单，只有深入解读源码后才能体会它真的是太会来事了，一般把它理解为阻塞链表就行。上面挂的是处于阻塞状态的进程。</li> <li><code>childrenList</code>孩子链表，所有由它fork出来的进程都挂到这个链表上。上面的孩子进程在死亡前会将自己从上面摘出去，转而挂到<code>exitChildList</code>链表上。</li> <li><code>exitChildList</code>退出孩子链表，进入死亡程序的进程要挂到这个链表上，一个进程的死亡是件挺麻烦的事，进程池的数量有限，需要及时回收进程资源，但家族管理关系复杂，要去很多地方消除痕迹。尤其还有其他进程在看你笑话，等你死亡(<code>wait</code>/<code>waitpid</code>)了通知它们一声。</li> <li><code>siblingList</code>兄弟链表，和你同一个父亲的进程都挂到了这个链表上。</li> <li><code>subordinateGroupList</code> 朋友圈链表，里面是因为兴趣爱好(进程组)而挂在一起的进程，它们可以不是一个父亲，不是一个祖父，但一定是同一个老祖宗(用户态和内核态根进程)。</li> <li><code>threadSiblingList</code>线程链表，上面挂的是进程ID都是这个进程的线程(任务)，进程和线程的关系是1:N的关系，一个线程只能属于一个进程。这里要注意任务在其生命周期中是不能改所属进程的。</li> <li><code>waitList</code> 是等待子进程消亡的任务链表，注意上面挂的是任务。任务是通过系统调用<div class="language-c line-numbers-mode"><pre class="language-c"><code><span class="token class-name">pid_t</span> <span class="token function">wait</span><span class="token punctuation">(</span><span class="token keyword">int</span> <span class="token operator">*</span>status<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">pid_t</span> <span class="token function">waitpid</span><span class="token punctuation">(</span><span class="token class-name">pid_t</span> pid<span class="token punctuation">,</span> <span class="token keyword">int</span> <span class="token operator">*</span>status<span class="token punctuation">,</span> <span class="token keyword">int</span> options<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div>将任务挂到<code>waitList</code>上。鸿蒙<code>waitpid</code>系统调用为<code>SysWait</code>，具体看进程回收篇。</li></ul> <p>双向链表是内核最重要的结构体，精读内核的路上它会反复的映入你的眼帘，理解它是理解内核运作的关键所在!</p> <h3 id="百文说内核-抓住主脉络">百文说内核 | 抓住主脉络</h3> <ul><li>百文相当于摸出内核的肌肉和器官系统，让人开始丰满有立体感，因是直接从注释源码起步，在加注释过程中，每每有心得处就整理,慢慢形成了以下文章。内容立足源码，常以生活场景打比方尽可能多的将内核知识点置入某种场景，具有画面感，容易理解记忆。说别人能听得懂的话很重要! 百篇博客绝不是百度教条式的在说一堆诘屈聱牙的概念，那没什么意思。更希望让内核变得栩栩如生，倍感亲切。</li> <li>与代码需不断<code>debug</code>一样，文章内容会存在不少错漏之处，请多包涵，但会反复修正，持续更新，<code>v**.xx</code> 代表文章序号和修改的次数，精雕细琢，言简意赅，力求打造精品内容。</li> <li>百文在 &lt; 鸿蒙研究站 | 开源中国 | 博客园 | 51cto | csdn | 知乎 | 掘金 &gt; 站点发布，百篇博客系列目录如下。</li> <li><img src="https://weharmonyos.oss-cn-hangzhou.aliyuncs.com/resources/common/cate.png" alt=""></li></ul> <p>按功能模块:</p> <table><thead><tr><th style="text-align:center;">基础知识</th> <th style="text-align:center;">进程管理</th> <th style="text-align:center;">任务管理</th> <th style="text-align:center;">内存管理</th></tr></thead> <tbody><tr><td style="text-align:center;"><a href="http://weharmonyos.com/blog/01.html" target="_blank" rel="noopener noreferrer">双向链表</a><br><a href="http://weharmonyos.com/blog/02.html" target="_blank" rel="noopener noreferrer">内核概念</a><br><a href="http://weharmonyos.com/blog/03.html" target="_blank" rel="noopener noreferrer">源码结构</a><br><a href="http://weharmonyos.com/blog/04.html" target="_blank" rel="noopener noreferrer">地址空间</a><br><a href="http://weharmonyos.com/blog/05.html" target="_blank" rel="noopener noreferrer">计时单位</a><br><a href="http://weharmonyos.com/blog/06.html" target="_blank" rel="noopener noreferrer">优雅的宏</a><br><a href="http://weharmonyos.com/blog/07.html" target="_blank" rel="noopener noreferrer">钩子框架</a><br><a href="http://weharmonyos.com/blog/08.html" target="_blank" rel="noopener noreferrer">位图管理</a><br><a href="http://weharmonyos.com/blog/09.html" target="_blank" rel="noopener noreferrer">POSIX</a><br><a href="http://weharmonyos.com/blog/10.html" target="_blank" rel="noopener noreferrer">main函数</a><br></td> <td style="text-align:center;"><a href="http://weharmonyos.com/blog/11.html" target="_blank" rel="noopener noreferrer">调度故事</a><br><a href="http://weharmonyos.com/blog/12.html" target="_blank" rel="noopener noreferrer">进程控制块</a><br><a href="http://weharmonyos.com/blog/13.html" target="_blank" rel="noopener noreferrer">进程空间</a><br><a href="http://weharmonyos.com/blog/14.html" target="_blank" rel="noopener noreferrer">线性区</a><br><a href="http://weharmonyos.com/blog/15.html" target="_blank" rel="noopener noreferrer">红黑树</a><br><a href="http://weharmonyos.com/blog/16.html" target="_blank" rel="noopener noreferrer">进程管理</a><br><a href="http://weharmonyos.com/blog/17.html" target="_blank" rel="noopener noreferrer">Fork进程</a><br><a href="http://weharmonyos.com/blog/18.html" target="_blank" rel="noopener noreferrer">进程回收</a><br><a href="http://weharmonyos.com/blog/19.html" target="_blank" rel="noopener noreferrer">Shell编辑</a><br><a href="http://weharmonyos.com/blog/20.html" target="_blank" rel="noopener noreferrer">Shell解析</a><br></td> <td style="text-align:center;"><a href="http://weharmonyos.com/blog/21.html" target="_blank" rel="noopener noreferrer">任务控制块</a><br><a href="http://weharmonyos.com/blog/22.html" target="_blank" rel="noopener noreferrer">并发并行</a><br><a href="http://weharmonyos.com/blog/23.html" target="_blank" rel="noopener noreferrer">就绪队列</a><br><a href="http://weharmonyos.com/blog/24.html" target="_blank" rel="noopener noreferrer">调度机制</a><br><a href="http://weharmonyos.com/blog/25.html" target="_blank" rel="noopener noreferrer">任务管理</a><br><a href="http://weharmonyos.com/blog/26.html" target="_blank" rel="noopener noreferrer">用栈方式</a><br><a href="http://weharmonyos.com/blog/27.html" target="_blank" rel="noopener noreferrer">软件定时器</a><br><a href="http://weharmonyos.com/blog/28.html" target="_blank" rel="noopener noreferrer">控制台</a><br><a href="http://weharmonyos.com/blog/29.html" target="_blank" rel="noopener noreferrer">远程登录</a><br><a href="http://weharmonyos.com/blog/30.html" target="_blank" rel="noopener noreferrer">协议栈</a><br></td> <td style="text-align:center;"><a href="http://weharmonyos.com/blog/31.html" target="_blank" rel="noopener noreferrer">内存规则</a><br><a href="http://weharmonyos.com/blog/32.html" target="_blank" rel="noopener noreferrer">物理内存</a><br><a href="http://weharmonyos.com/blog/33.html" target="_blank" rel="noopener noreferrer">内存概念</a><br><a href="http://weharmonyos.com/blog/34.html" target="_blank" rel="noopener noreferrer">虚实映射</a><br><a href="http://weharmonyos.com/blog/35.html" target="_blank" rel="noopener noreferrer">页表管理</a><br><a href="http://weharmonyos.com/blog/36.html" target="_blank" rel="noopener noreferrer">静态分配</a><br><a href="http://weharmonyos.com/blog/37.html" target="_blank" rel="noopener noreferrer">TLFS算法</a><br><a href="http://weharmonyos.com/blog/38.html" target="_blank" rel="noopener noreferrer">内存池管理</a><br><a href="http://weharmonyos.com/blog/39.html" target="_blank" rel="noopener noreferrer">原子操作</a><br><a href="http://weharmonyos.com/blog/40.html" target="_blank" rel="noopener noreferrer">圆整对齐</a><br></td></tr> <tr><td style="text-align:center;">通讯机制</td> <td style="text-align:center;">文件系统</td> <td style="text-align:center;">硬件架构</td> <td style="text-align:center;">内核汇编</td></tr> <tr><td style="text-align:center;"><a href="http://weharmonyos.com/blog/41.html" target="_blank" rel="noopener noreferrer">通讯总览</a><br><a href="http://weharmonyos.com/blog/42.html" target="_blank" rel="noopener noreferrer">自旋锁</a><br><a href="http://weharmonyos.com/blog/43.html" target="_blank" rel="noopener noreferrer">互斥锁</a><br><a href="http://weharmonyos.com/blog/44.html" target="_blank" rel="noopener noreferrer">快锁使用</a><br><a href="http://weharmonyos.com/blog/45.html" target="_blank" rel="noopener noreferrer">快锁实现</a><br><a href="http://weharmonyos.com/blog/46.html" target="_blank" rel="noopener noreferrer">读写锁</a><br><a href="http://weharmonyos.com/blog/47.html" target="_blank" rel="noopener noreferrer">信号量</a><br><a href="http://weharmonyos.com/blog/48.html" target="_blank" rel="noopener noreferrer">事件机制</a><br><a href="http://weharmonyos.com/blog/49.html" target="_blank" rel="noopener noreferrer">信号生产</a><br><a href="http://weharmonyos.com/blog/50.html" target="_blank" rel="noopener noreferrer">信号消费</a><br><a href="http://weharmonyos.com/blog/51.html" target="_blank" rel="noopener noreferrer">消息队列</a><br><a href="http://weharmonyos.com/blog/52.html" target="_blank" rel="noopener noreferrer">消息封装</a><br><a href="http://weharmonyos.com/blog/53.html" target="_blank" rel="noopener noreferrer">消息映射</a><br><a href="http://weharmonyos.com/blog/54.html" target="_blank" rel="noopener noreferrer">共享内存</a><br></td> <td style="text-align:center;"><a href="http://weharmonyos.com/blog/55.html" target="_blank" rel="noopener noreferrer">文件概念</a><br><a href="http://weharmonyos.com/blog/56.html" target="_blank" rel="noopener noreferrer">文件故事</a><br><a href="http://weharmonyos.com/blog/57.html" target="_blank" rel="noopener noreferrer">索引节点</a><br><a href="http://weharmonyos.com/blog/58.html" target="_blank" rel="noopener noreferrer">VFS</a><br><a href="http://weharmonyos.com/blog/59.html" target="_blank" rel="noopener noreferrer">文件句柄</a><br><a href="http://weharmonyos.com/blog/60.html" target="_blank" rel="noopener noreferrer">根文件系统</a><br><a href="http://weharmonyos.com/blog/61.html" target="_blank" rel="noopener noreferrer">挂载机制</a><br><a href="http://weharmonyos.com/blog/62.html" target="_blank" rel="noopener noreferrer">管道文件</a><br><a href="http://weharmonyos.com/blog/63.html" target="_blank" rel="noopener noreferrer">文件映射</a><br><a href="http://weharmonyos.com/blog/64.html" target="_blank" rel="noopener noreferrer">写时拷贝</a><br></td> <td style="text-align:center;"><a href="http://weharmonyos.com/blog/65.html" target="_blank" rel="noopener noreferrer">芯片模式</a><br><a href="http://weharmonyos.com/blog/66.html" target="_blank" rel="noopener noreferrer">ARM架构</a><br><a href="http://weharmonyos.com/blog/67.html" target="_blank" rel="noopener noreferrer">指令集</a><br><a href="http://weharmonyos.com/blog/68.html" target="_blank" rel="noopener noreferrer">协处理器</a><br><a href="http://weharmonyos.com/blog/69.html" target="_blank" rel="noopener noreferrer">工作模式</a><br><a href="http://weharmonyos.com/blog/70.html" target="_blank" rel="noopener noreferrer">寄存器</a><br><a href="http://weharmonyos.com/blog/71.html" target="_blank" rel="noopener noreferrer">多核管理</a><br><a href="http://weharmonyos.com/blog/72.html" target="_blank" rel="noopener noreferrer">中断概念</a><br><a href="http://weharmonyos.com/blog/73.html" target="_blank" rel="noopener noreferrer">中断管理</a><br></td> <td style="text-align:center;"><a href="http://weharmonyos.com/blog/74.html" target="_blank" rel="noopener noreferrer">编码方式</a><br><a href="http://weharmonyos.com/blog/75.html" target="_blank" rel="noopener noreferrer">汇编基础</a><br><a href="http://weharmonyos.com/blog/76.html" target="_blank" rel="noopener noreferrer">汇编传参</a><br><a href="http://weharmonyos.com/blog/77.html" target="_blank" rel="noopener noreferrer">链接脚本</a><br><a href="http://weharmonyos.com/blog/78.html" target="_blank" rel="noopener noreferrer">内核启动</a><br><a href="http://weharmonyos.com/blog/79.html" target="_blank" rel="noopener noreferrer">进程切换</a><br><a href="http://weharmonyos.com/blog/80.html" target="_blank" rel="noopener noreferrer">任务切换</a><br><a href="http://weharmonyos.com/blog/81.html" target="_blank" rel="noopener noreferrer">中断切换</a><br><a href="http://weharmonyos.com/blog/82.html" target="_blank" rel="noopener noreferrer">异常接管</a><br><a href="http://weharmonyos.com/blog/83.html" target="_blank" rel="noopener noreferrer">缺页中断</a><br></td></tr> <tr><td style="text-align:center;">编译运行</td> <td style="text-align:center;">调测工具</td> <td style="text-align:center;"></td> <td style="text-align:center;"></td></tr> <tr><td style="text-align:center;"><a href="http://weharmonyos.com/blog/84.html" target="_blank" rel="noopener noreferrer">编译过程</a><br><a href="http://weharmonyos.com/blog/85.html" target="_blank" rel="noopener noreferrer">编译构建</a><br><a href="http://weharmonyos.com/blog/86.html" target="_blank" rel="noopener noreferrer">GN语法</a><br><a href="http://weharmonyos.com/blog/87.html" target="_blank" rel="noopener noreferrer">忍者无敌</a><br><a href="http://weharmonyos.com/blog/88.html" target="_blank" rel="noopener noreferrer">ELF格式</a><br><a href="http://weharmonyos.com/blog/89.html" target="_blank" rel="noopener noreferrer">ELF解析</a><br><a href="http://weharmonyos.com/blog/90.html" target="_blank" rel="noopener noreferrer">静态链接</a><br><a href="http://weharmonyos.com/blog/91.html" target="_blank" rel="noopener noreferrer">重定位</a><br><a href="http://weharmonyos.com/blog/92.html" target="_blank" rel="noopener noreferrer">动态链接</a><br><a href="http://weharmonyos.com/blog/93.html" target="_blank" rel="noopener noreferrer">进程映像</a><br><a href="http://weharmonyos.com/blog/94.html" target="_blank" rel="noopener noreferrer">应用启动</a><br><a href="http://weharmonyos.com/blog/95.html" target="_blank" rel="noopener noreferrer">系统调用</a><br><a href="http://weharmonyos.com/blog/96.html" target="_blank" rel="noopener noreferrer">VDSO</a><br></td> <td style="text-align:center;"><a href="http://weharmonyos.com/blog/97.html" target="_blank" rel="noopener noreferrer">模块监控</a><br><a href="http://weharmonyos.com/blog/98.html" target="_blank" rel="noopener noreferrer">日志跟踪</a><br><a href="http://weharmonyos.com/blog/99.html" target="_blank" rel="noopener noreferrer">系统安全</a><br><a href="http://weharmonyos.com/blog/100.html" target="_blank" rel="noopener noreferrer">测试用例</a><br></td> <td style="text-align:center;"></td> <td style="text-align:center;"></td></tr></tbody></table> <h3 id="百万注源码-处处扣细节">百万注源码 | 处处扣细节</h3> <ul><li><p>百万汉字注解内核目的是要看清楚其毛细血管，细胞结构，等于在拿放大镜看内核。内核并不神秘，带着问题去源码中找答案是很容易上瘾的，你会发现很多文章对一些问题的解读是错误的，或者说不深刻难以自圆其说，你会慢慢形成自己新的解读，而新的解读又会碰到新的问题，如此层层递进，滚滚向前，拿着放大镜根本不愿意放手。</p></li> <li><p><a href="https://gitee.com/weharmony/kernel_liteos_a_note" target="_blank" rel="noopener noreferrer">&lt; gitee</a> | <a href="https://github.com/kuangyufei/kernel_liteos_a_note" target="_blank" rel="noopener noreferrer">github</a> | <a href="https://weharmony.coding.net/public/harmony/kernel_liteos_a_note/git/files" target="_blank" rel="noopener noreferrer">coding</a> | <a href="https://gitcode.net/kuangyufei/kernel_liteos_a_note" target="_blank" rel="noopener noreferrer">gitcode &gt;</a> 四大码仓推送 | 同步官方源码。</p> <p><a href="https://gitee.com/weharmony/kernel_liteos_a_note" target="_blank" rel="noopener noreferrer"><img src="https://gitee.com/weharmony/kernel_liteos_a_note/widgets/widget_card.svg?colors=393222,ebdfc1,fffae5,d8ca9f,393222,a28b40" alt=""></a></p></li></ul> <h3 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        <svg viewBox="0 0 1024 1024" xmlns="http://www.w3.org/2000/svg" class="icon next-icon"><path d="M906.772 512c0 4.772-2.211 9.267-5.99 12.175L524.257 813.66a15.37 15.37 0 0 1-18.616.092 15.368 15.368 0 0 1-5.038-17.91l75.714-191.672h-443.73c-8.488 0-15.36-6.881-15.36-15.36v-153.6c0-8.489 6.872-15.36 15.36-15.36h443.73l-75.714-191.682a15.358 15.358 0 0 1 5.048-17.91c5.51-4.158 13.128-4.137 18.606.092l376.525 289.485a15.323 15.323 0 0 1 5.99 12.165z" fill="currentColor"></path></svg></a></span></p></div> <!----> <!----> <div class="content__page-bottom"></div></main> <!----></div><div class="global-ui"><!----><!----><div id="pwa-install"><!----> <div id="install-modal-wrapper" style="display:none;"><div class="background"></div> <div class="install-modal"><div class="header"><button aria-label="Close" class="close-button"><svg width="23" height="22" xmlns="http://www.w3.org/2000/svg" class="icon close-icon"><path fill-rule="evenodd" clip-rule="evenodd" d="M1.12.358a1.224 1.224 0 011.729 0l8.92 8.914L20.686.358a1.224 1.224 0 011.73 1.728L13.497 11l8.92 8.913a1.222 1.222 0 11-1.73 1.729l-8.919-8.913-8.92 8.913a1.224 1.224 0 01-1.729-1.729L10.04 11l-8.92-8.914a1.222 1.222 0 010-1.728z" fill="currentColor"></path></svg></button> <div class="logo"><!----> <div class="title"><h1></h1> <p class="desc">This app can be installed on your PC or mobile device.  This will allow this web app to look and behave like any other installed app.  You will find it in your app lists and be able to pin it to your home screen, start menus or task bars.  This installed web app will also be able to safely interact with other apps and your operating system. </p></div></div></div> <div class="content"><div class="highlight"><!----> <!----></div> <div class="description"><h3>Description</h3> <p></p></div></div> <div class="button-wrapper"><button class="install-button">
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